What should I do if the domain name server fails? Detailed explanation of cause investigation and repair methods

in website operation and daily network use, the domain name server is the core bridge connecting the domain name and the Internet Protocol Address. Once a failure occurs, it can lead to slow website access, and it can directly cause problems such as website inaccessibility and email service interruption, which will have a serious impact on enterprise operation and user experience. Many users are often at a loss when encountering such problems and do not know where to start. This article will analyze the common causes of domain name server failures, dismantle the troubleshooting process step by step, and give practical repair methods to help you solve such network problems efficiently.

How to initially troubleshoot the domain name server?

when it is found that the website cannot be accessed or the domain name resolution is abnormal, the first thing to do is to do a preliminary investigation to confirm whether the problem is really on the domain name server, so as to avoid misjudgment and waste of time.

1, testing local network connectivity

first eliminate local network problems, you can try to access other well-known websites, if other websites can be opened normally, indicating that the local network is basically normal, and the probability of failure is related to the domain name server; if all websites cannot be accessed, you need to check the router, network cable and other hardware equipment, or contact the network operator to confirm the network status.

2 Use parsing tools to detect status

use nslookup, dig and other professional tools to query domain name resolution results, if the tool returns "server failed" "domain name cannot be found" and other prompts, or the resolved Internet Protocol Address does not match expectations, it can be determined that the domain name server is abnormal, and further investigation is required.

What are the common causes of domain name server failure?

find the root cause of the failure is the key to solve the problem, the cause of domain name server failure is diverse, mainly concentrated in the network, service providers, configuration and other aspects.

1, domain name server service provider failure

some small domain name server service providers may have problems such as outdated hardware equipment and insufficient bandwidth. When encountering sudden traffic attacks or system upgrades, they are prone to server downtime, parsing delays and other failures. In addition, if the service provider's computer room encounters force majeure such as power outages and fires, it will also directly cause the domain name server to fail to work normally.

2, the name server configuration error

when users modify the domain name resolution configuration, there may be problems such as wrong record type selection, wrong Internet Protocol Address filling in, and unreasonable TTL value setting. These configuration errors will directly cause the domain name server to fail to resolve the domain name correctly, causing access failures. In addition, if the domain name expires and is not renewed in time, the domain name server will also suspend the resolution service.

3. Targeted repair methods for domain name server failures?

for the failure of the domain name server caused by different reasons, corresponding repair methods need to be taken in order to quickly restore the normal operation of the service.

1, service provider failure response plan

if it is determined that the domain name server service provider is faulty after investigation, first contact the service provider customer service to understand the cause of the failure and the estimated recovery time; if the recovery time is long, you can temporarily switch to the standby domain name server, such as using a public DNS server, first protect the basic access function of the website, and then decide whether to switch back according to the situation after the original service provider is restored.

2, wrong configuration repair steps

first log in to the domain name management background, check whether the parsing record type, Internet Protocol Address, TTL value and other parameters are correct, if an error is found to modify in time, wait 10-30 minutes for the configuration to take effect after modification; if the domain name expires, it is necessary to complete the renewal operation immediately. Generally, the domain name server will resume the resolution service within 1-2 hours after renewal.

4. How to prevent the domain name server failure from happening again?

solve the existing fault, but also take preventive measures to reduce the probability of domain name server failure, to ensure the long-term stability of network services.

1, choose a reliable domain name server service provider

give priority to large-scale service providers with high reputation and good reputation. Such service providers have complete infrastructure such as multi-room backup and high-defense attack systems, which can effectively reduce the failure rate and provide 7 × 24-hour technical support.

2, configure multiple groups of domain name server standby

don't just rely on a single domain name server, you can configure 2-3 groups of different service providers' domain name servers as backup at the same time. When the main server fails, the backup server can automatically take over the resolution work and avoid service interruption. In addition, regular backup of domain name resolution configuration can also be quickly restored in the event of configuration errors.

To sum up, domain name server failures are common problems in network use. To solve such problems, we need to follow the idea of "first troubleshooting and then repairing, and finally doing a good job of prevention". First, through network testing and tool detection, we will initially locate the problem, and then find the cause of the failure from the service provider, configuration and other directions. Then take targeted measures to repair, and finally prevent the recurrence of failures by selecting reliable service providers and configuring backup servers. As long as you master these methods, you can efficiently deal with domain name server failures and ensure the stable operation of websites and network services.